【Precision size】Diamond grinding bit is 8mm/0.3" head with 1/8 standard shank , perfectly compatible with most electric rotary tools accessories bit, providing precise cutting control force to meet precision carving and polishing needs. 【Ultra hard 】 Diamond abrasive is manufactured by CVD chemical vapor deposition method, Mohs hardness is 8 levels. Cutting efficiency increase of 300%, burr bits maintain sharpness after continuous work. 【Electroplating manufacturing】 Multi layer electroplating technology embeds diamond particles deeply into the metal substrate. abrasive is not easy to fall off ,very durable 【Versatile applications 】Art field: stone carving set, wood carving tools,jewelry jade polishing tool,ceramic engraving bit .Industrial : stainless steel weld scar cleaning, Steel rust removal. Life services: pet nail grinder replacement heads, hobbies repair and making tool etc Grit: 120#;Shank Diameter : 1/8;Head Diameter : 8mm/0.3";Head Length : 13mm/ 0.51";Total Length : 45mm/ 1.8".Material : Metal, Diamond.Weight :56g .Package : 10 x Diamond Mounted Point Cylindrical tip, diamond coated head. Can be installed on the electronic grinder, hanging mill and hand electric drill (not included here). Used for sculpturing, dressing, precision grinding and internal grinding carbide in ceramic, glass, precious stone, alloy and many other abrasive materials..